landscapemetrics (version 1.4.4)

lsm_l_lsi: LSI (landscape level)

Description

Landscape shape index (Aggregation metric)

Usage

lsm_l_lsi(landscape, directions)
# S3 method for RasterLayer
lsm_l_lsi(landscape, directions = 8)
# S3 method for RasterStack
lsm_l_lsi(landscape, directions = 8)
# S3 method for RasterBrick
lsm_l_lsi(landscape, directions = 8)
# S3 method for stars
lsm_l_lsi(landscape, directions = 8)
# S3 method for list
lsm_l_lsi(landscape, directions = 8)

Arguments

landscape

Raster* Layer, Stack, Brick or a list of rasterLayers.

directions

The number of directions in which patches should be connected: 4 (rook's case) or 8 (queen's case).

Value

tibble

Details

$$LSI = \frac{E} {\min E}$$ where \(E\) is the total edge length in cell surfaces and \(\min E\) is the minimum total edge length in cell surfaces

LSI is an 'Aggregation metric'. It is the ratio between the actual landscape edge length and the hypothetical minimum edge length. The minimum edge length equals the edge length if only one patch would be present.

Units

None

Ranges

LSI >= 1

Behaviour

Equals LSI = 1 when only one squared patch is present. Increases, without limit, as the length of the actual edges increases, i.e. the patches become less compact.

References

McGarigal, K., SA Cushman, and E Ene. 2012. FRAGSTATS v4: Spatial Pattern Analysis Program for Categorical and Continuous Maps. Computer software program produced by the authors at the University of Massachusetts, Amherst. Available at the following web site: http://www.umass.edu/landeco/research/fragstats/fragstats.html

Patton, D. R. 1975. A diversity index for quantifying habitat "edge". Wildl. Soc.Bull. 3:171-173.

See Also

lsm_p_shape, lsm_c_lsi

Examples

# NOT RUN {
lsm_l_lsi(landscape)

# }